Re: External audio recorder
 

Why record to a multi track recorder?
You may only input two channels (tracks) to your camera, but depending upon the NLE you use, you may be able to import any number of tracks.
The advantage of using the MixPre is that once you have imported the MixPre recorded tracks into the NLE, you can edit (manipulate) the content of each individual track to obtain the best possible audio to accompany the video.
Maybe one of your narrators has a cough. You can edit that portion of the audio out of that track and have a cleaner sounding track. You could delete the cough audio and replace it with an equal duration of the empty room noise you recorded for just such a purpose. This way, you would not hear a drop out that a flat line waveform produces.
Maybe you want to have a narrator dub an audio track for a slideshow. Just use the recorder with a mic as the narrator describes each slide. [https://vimeo.com/193752056]
You can even have multiple narrators.